warpsql: Add support for Citus extension

[jayanth-kumar-morem]

1. Update Dockerfile
2. Install Citus dependencies (curl, jq)
3. Add build dependencies for Citus (gcc, libc-dev, make, curl-dev, lz4-dev, libxslt-dev, libxml2-dev)
4. Download and install Citus with specified version
5. Remove build dependencies and cleanup temporary files after Citus installation

Fixes: #3

[ChakshuGautam]

Hey @jayanth-kumar-morem can you check the smoke tests? They are failing right now.

[jayanth-kumar-morem]

Hi @ChakshuGautam , Didn't realise of an active PR, I was testing in my forked repo. Closing this right now. Will raise it once the tests pass.